Here's that "1947" block I'm working on. If it does go onto the front of the LIST-3310, I'll drill Ø0.028" kill bleeds into the angled passages that feed the boosters. That's not usually common in straight leg booster carburetors, but is common in all 3310's I've had open, so the usual PVCRs (Ø0.062"), main jets (#72), and main air bleeds (~Ø0.025") will have (or should have) all been sized for kill bleeds.
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